u/clb5335

My homemade soft start for 18-20v conversion. my understanding is that 18-20V Lithium batteries destroy motors and switches mainly because of the 0 rpm current surge. lithium can send a much bigger surge than lead acid even at the same voltage, so when you increase the voltage and change to lithium batteries its really hard on stock hardware. My homemade solution is to run the power through a 1 ohm resistor for less than half a second to get the wheels spinning, then bypass the resistor for full power. on a 20v system this will limit the initial current surge to 20 amps. I've been running it on a pet perego 4 wheeler for a few months without problems. fingers crossed it holds up long term.